基于幻方变换的HEVC熵编码加密方案

摘要

针对多媒体信息安全问题,基于高效视频编码标准(HEVC/H.265)的熵编码模块,结合幻方变换矩阵,设计了一种具有实时性和高效性的面向高清视频流的加密算法.该算法有效利用变换系数的分布稀疏性,置乱变换块(TB)的系数组(CG),并对CG熵编码的语法元素进行了选择性加密.实验结果表明,本文的加密方案具有高安全性,保证格式兼容性并仅对编码比特率造成很小的影响,满足视频加密保护的需求.%In view of the multimedia information security,based on the entropy module on high efficiency video coding (HEVC/H.265),combined with the magic square,a real time and high efficiency encryption technique for high-definition video streaming was proposed.The algorithm which had an effective use of transform coefficient sparsity enabled coefficient group (CG) of transform block (TB) scrambling,and used a selective encryption on syntax elements in CG's entropy.The experiments prove that the investigated scheme has high security,which can guarantee the standard compliance and the demand of video encryption while having a low impact on encoding-rate performance.